Selling my King Arms Airsoft Gun - What's a good price?

Looking to sell my airsoft gun that I NEVER even gamed with. I just shot it around the house for fun. It's in LIKE-NEW condidtion... WHAT'S A GOOD SELL PRICE?

Check out the video I made for more info and details: http://www.youtube.com/watch?v=fwF8HuHgp_Y

I paid $550 for this AEG and another $120 for the Tokyo Marui Tracer Unit...

Here's the details:

King Arms Limited Edition MAGPUL M4 PTS Custom Airsoft AEG Rifle Demo Video! This is definitely a functional show piece that (at the time of purchase) was a limited collector's edition of only 500 made! Mainly kept on a stand for show and tell. It's in a LIKE-NEW condition with a near flawless finish (w/ minor almost non-visible blemishes).

This has AMAZING detail... Laser etching of Troy Industries and VLTOR! With Magpul PTS accessories! Other than the Magpul accessories, EVERYTHING IS METAL (Internally & Externally)! Functions flawlessly with all stock internals! Hardly used as I mentioned so there shouldn't be any wear on the high quality gears.

Features:

- Full metal AEG

- High Quality 7mm Bearing Metal Gearbox

- 11.1V 1100mAh 15C Lithium Battery and charger set included.

- 120 Magpul PTS P-mag (included)

- Weight: 2.80 kg

- Length: 65-73 cm

Muzzle Velocity: 330~360 FPS

-King Arms M7A1 MRF Free Float RAS

-King Arms MUR Receiver (Easy Disassembly)

-VLTOR Bolt Locking & Functional Bolt Catch

-King Arms M7A1 QD Sling Mount

-Magpul PTS Enhanced Trigger Guard

-Magpul PTS CTR Retractable Stock w/ Rubber Buttpad

-Magpul PTS MIAD Grip

-Magpul PTS 120R PMAG

-King Arms Troy style Flip-Up Front Sight & Rear Sight

Also included!

-2nd Generation Tokyo Marui Tracer Unit (metal housing, batteries not included)

-Adapter to attach Tracer Unit

-Extra BB's (standard + glow in the dark rounds)